This is a new patch release that resolves a memory leak issue found in the 3.8.0 and 3.7.x releases. If you are running an older release you are strongly advised to upgrade (you can work around the leak by disabling message audit in your ActiveMQConnectionFactory).
This release is based on the CMS 3.2 API.
Check out the API for this release here
For a more detailed view of new features and bug fixes, see the release notes